I've had some trouble while meditating. I can sustain meditation for about a minute, and then i get to a point where i can get some intense sensations which are hard to describe, and that inevitably brings me back to "the real world". I would describe them as tingling up and down my spine. That's as far as words go. I don't have this kind of problem in a dojo, only when i sit in seiza and meditate at home. Might this be due to the fact that we don't meditate for a long time at the dojo? Our meditations are usually before and after the training, and they last for about 30 seconds.
Do you have any idea what i could do to get over this problem, and have you had a similar experience?
Any feedback would be appreciated.